Dynamo-electric machine.



H. F. T. ERBEN & W. J. DELLES.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED MAR.19. 1913.

1,156,675. Patented Oct. 12, 1915.

1 4 4 Wmiam J-Delles Th e irfit ornu UNITED s'ra'ras rarnwr enema) HERMANN F. T. ERIBEN, AND WILLIAM J. DELLES, OF SCHENECTADY, NEW YORK, ASSIGNORS TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

tric machines.

DYNAMO-ELECTRIC MACHINE.

Application filed March 19, 1913.

T 0 all whom it may concern Belt known that we, HERMANN F T. ER-

BEN and'WiLLIAM J. DnLLEs, citizens of leakage flux, but at the same timeit is de-' sirable that the flux due to the main field winding shall be uniformly distributed over the faces of the field member.

Heretofore the conductors of compensating windings have been arranged in layers in slots in the field member of dynamo elec- Such an arrangement requires deep, rectangular slots, which necessitates'a much greater depthof the field member than that of a field member of a dynamo electric machine not provided with compensating windings! If a compensating winding is provided in a machine having a field member provided with definite pole pieces, the compensating winding is arranged in slots in the pole faces of the pole pieces, which necessitates deep pole pieces and pole tips large enough to provide room for the s ts, because rectangular slots must be placed'at such a' distance from-the pole face as not to choke the flux Which tends to pass through that portion of the pole face directly under the slots, and at such a dis..

tance fromthe edges of the pole tips as not to choke the flux which tends to pass around the slots, partibularly between them and the edges of the pole tips.

Our invention has for its object to decrease the depth of field members'having definite poles and provided with compensating windings, and consists in a novel arrangement of the compensating windings whereby they occupy a minimum space.

The various features of novelty which characterize our invention are pointed out with particularity inthe claims annered to and forming a part of this specification.

For a better understanding of our invention, reference may be had to the following Specification of- Letters Patent.

Patented Oct. 12, 1915.

Serial No. 755,536.

description taken in connection with the ac companying drawing, in which Figure l is a diagrammatic view of a dynamo electric machine provided with delinite pole pieces and embodying our invention; Fig. 2 is an end view of a pole piece of Fig. 1; Fig. 3 is a sectional view on the line 33 of Fig. 2, and Fig. .2 is a sectional view on the line li of Fig. 2.

Referring to the drawing, 1 is a field member of a dynamo electric machine provided with slots 2 in which a compensating winding is placed. flie compensating wind- 5 which are suitably insulated from each other'and the slots 2 and are connected up to form a continuous winding.

In the particular construction shown, our compensating winding is applied to a machine of the direct current type, the field member of which has definite main poles 6 and commutating poles 7. The conductors of the compensating winding are placed in the slots 2 in the pole faces 8 of the poles 6. The conductors l are r substantially cylindrical copper rods, which are surrounded with tubes of mica 9, which in turn are surrounded by substantially cylindrical copper tubes forming the conductors 5. The conductors 5 may be shrunk in place on the tubes of mica 9. The conductors 5 are suitably insulated from the slots 2 as by tubes of insulation. The conductors 4 are longer than the conductors The ends-of the conductors a and 5 are provided with clips 10 and 11, by means of which these conductors shown diagraimnatically in Fig. 1, in which the-conductors 4 on one half of each pole are connected in series w1th the conductors 4 on the adjacent half of thenext pole, and

also in series with the corresponding conductors 5 on the same halves of both of these poles. The conductors so connected form a set, and in a four pole machine, as shown in the drawing, there will be four such sets. These sets of conductors are all connected in series, but each set is reversed with respect to the. adjacent sets. The continuous winding thus formed is connected up in the usual way so as to be supplied with a current which is equal to, or proportional to, the armature current, but which flows in a direction opposite to that in the armature coning comprises concentric conductors 4: and- .ductors directly opposite them so as to com- I pensate for the armature reaction.

lVe desire it to be understood that our invention is not limited to the particular arrangement shown and described, and we'aim in the appended claims to cover all modifications which do not depart from the spirit and scope of our invention.

WVhat we claim as new and desire to secure by Letters Patent of the United States, 1s:

1. Ina dynamo electric machine, a field the pole faces and the pole tips of said pole pieces, said compensating Winding comprising substantially cylindrical rods and substantially cylindrical tubes surrounding said rods, said tubes being insulated from said rods and said pole pieces.

ing substantially cylindrical rods, substantially cylindrical tubes surrounding said I rods, said tubes being shorter than s'aidrods and insulated from said rods and said pole pieces, and clips on-the ends of'said rods and said tubes whereby said rods and tubes are connected up to form a continuous Wind 1 in witness whereof, We have hereunto set our hands this 18th day of March, 1913.

HERMAN N F. T. ERBEN WILLIAM J. DELLES. Witnesses:

' BENJAMIN B; HULL,

IIELEN ORFORD. 

